OP, what is it that you're trying to achieve? Of course your grocery bill will be far more than average if everything you're buying is the most expensive version possible.
Most people are spending more money on grocery shopping at the moment as they're eating just about everything at home and there's restricted choice and fewer or no special offers. In many cases this will be offset in some way by lower spending elsewhere as no bought lunches or coffees, or eating out, although not in all cases as there are quite a few people who get fed at work for free, which I didn't realise, but have seen mentioned on here a few times.
But you may have heard of the programme Eat Well for Less. That would always start with stating how much the family spent on food and how it compared with the national average, according to the Office of National Statistics, not from the results of asking a few Mumsnetters with higher than average budgets who think that it's normal to shop in Waitrose or use Ocado and buy whatever you want without looking at any of the prices. So the average for the whole country for a family with one DC would be about £80-90. Which is an average, ie some spend that, but some spend less and some spend more.
Unfortunately some people have to spend less because they need to try and get enough to eat on a small budget. Other people will spend less on food to free up money for other things they'd prefer to buy.
They'll be buying lots of the cheaper vegetables - normal broccoli, not organic sprouting broccoli for example so far far cheaper. Eg on Waitrose.com, the cheapest normal loose broccoli is £1.75 per kilo, the most expensive is £11.75 per kilo for Duchy tenderstem, but they're both broccoli, just that one is nearly SEVEN TIMES the cost of the other. Do this for all your items and it's not hard to see why your bill is so high.
You mention fish, and I remember reading on here years ago someone who mentioned that a fish pie cost £28 to make, because they bought all the fish from the Waitrose fresh fish counter, yet if I make a fish pie, I'll use basic frozen white fish from somewhere like Aldi or Iceland, again, much much cheaper. I also look out for bargains and freeze them, our Co-op recently closed prior to refurbishment and I got a kilo of frozen tiger prawns for under a fiver, instead of the normal price of nearly £20.
I keep squid in the freezer, from when Lidl has Greek week and it is sold quite cheaply. So if I make a fish paella, it contains my reduced prawns and frozen fish and squid and I might throw in one of those boil in the bag in garlic butter sauce packs, so a big pan of paella would be quite a cheap meal that tastes pretty much the same as the one made with seafood costing 4/5/6 times the price from the Waitrose fish counter or artisan fishmonger.
You say your DH expects large portions of organic meat and other very expensive things, but complains about the cost of the grocery bill. Well obviously you shouldn't have to spell it out to him, but maybe you should.
Or you could sit down and meal plan together with costings and make sure he realises that he is a big part of the problem and if he wants the grocery bill to be less he has to give up some of the more expensive options. And it doesn't follow that more expensive = more healthy/nutritious, ie I don't believe for a second that broccoli that costs seven times more than the cheapest version is seven times better for you.
If you can afford to spend a lot on food, it's totally fine to do so, but what's not fine is to spend all that money if you can't afford it, especially when it's not evenly distributed throughout the family and, for example, you're eating beans on toast, to free up money for him to have a lot of organic meat. If he insists on lots of expensive options, he should pay for some of them out of his own personal spending money.